Question

Select One Option Correct from the following :A stone tied to a string of length L is whirled in a vertical circle with the other end of the string at the centre. At a certain instant of time, the stone is at its lowest position, and has speed u. The magnitude of the change in its velocity as it reaches a position where the string is horizontal is
(A) $\sqrt{u^2-2gL}$
(B) $\sqrt{2gL}$
(C) $\sqrt{u^2-gL}$
(D) $\sqrt{2(u^2-gL)}$

Answer 1

b option is correct.
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Answer 2

Select One Option Correct from the following :A stone tied to a string of length L is whirled in a vertical circle with the other end of the string at the centre. At a certain instant of time, the stone is at its lowest position, and has speed u. The magnitude of the change in its velocity as it reaches a position where the string is horizontal is

(A) $\sqrt{u^2-2gL}$

✔️(B) $\sqrt{2gL}$

(C) $\sqrt{u^2-gL}$

(D) $\sqrt{2(u^2-gL)}$